388, Heavy Duty Trucks - Conventional Trucks w/ Sleeper, Cummins ISX15, 18 Spd, FOR MORE INFORMATION CONTACT PRESTON AT 916-203-7352. Very clean tractor with all service records available!, 550 Horse Power, Air Trac Suspension, Aluminum Wheels, 280 Wheel Base, 11R24.5, Tandem Axle, Ratio, 48 Flat Top Sleeper